What a lucky little girl she is that she wandered into your garden. In time, she will start trusting you and will become friendly. She sure has a cute little home
. I think getting her spayed is a great idea, before you end up with a litter of kittens to worry about. All the shelters I know will do a spay for a reduced fee for a feral cat. In some places, where feral cats are a problem, there are groups that will take care of it. Without feral cats, we would be overrun with mice and rats, so they deserve whatever help they can get from us. Including high-end homes with room service
. Bless you for looking out for that little girl.